Category:68000 Assembly: Difference between revisions
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→Notation Conventions
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* The operand of <code>BTST</code>,<code>BSET</code>,<code>BCLR</code>, or <code>BCHG</code> represents a bit position, starting at the rightmost binary digit as 0 and counting up from right to left. For example, <code>BCLR #3,D0</code> performs the same bitwise operation that you would get from doing <code>AND.B #%11110111,D0</code>.
* The operand before the comma is the "source", and the operand after is the "destination." For example, <code>MOVE.L D3,D2</code> takes the value in D3 and stores it into D2, not the other way around. This is the opposite of x86 and ARM, which have the source on the right and the destination on the left.
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